Here is another link. This is a great first step but there are years of research that are needed.

http://www.platinum.matthey.com/medi...

"Is this a high potential technology?"

"Mitsui hopes to extend the application of this catalyst to trucks, buses and passenger cars. This will require extensive testing and development in order to prove that silver can be a more cost-effective material than already existing platinum DPF systems and to overcome its known drawbacks. Silver can easily sinter and may even vaporise at elevated temperature. It is also susceptible to poisoning by sulphur, reacting with sulphur to form silver sulphate (AgSO4), a very stable compound which cannot be decomposed or reduced back to silver except at high temperature. Stabilisation of silver is essential in order to provide the thermal durability required for commercial use."